Borla M4 Exhaust

2015 M3 M4 BMW Borla Down Pipe 60557 Section: straight pipes to replace stock rear catalytic converters. Installation: clamp-on These Borla Test Pipes replace the secondary cats on the F80 M3 and F82 M4i with the S55 engine. These are perfect for setting up your own custom exhaust as they bolt on to the stock downpipes with factory-style flanges. At the back of this section is an open pipe that can be used with the Borla cat-back mufflers or with another system of your own design (these are not designed to work with the stock exhaust system). Eliminating any part of the stock emissions equipment means this piece is for off road use only. Every Borla is made with 304 stainless steel for the internals and muffler body. Unlike other systems that can use coated aluminum, mild steel, or 409 stainless, the Borla uses true 304 stainless on the inside as well as the outside. This prevents the muffler from rusting and deteriorating from the inside out. Borla guarantees every muffler with a 1,000,000 mile warranty. Turner Motorsport has been the leading Borla dealer for BMW exhausts since we sold our first system in 1996, including using Borla Exhausts on every Turner BMW racecar. This is a race exhaust system which uses sport catalyzers designed for maximum flow while still reducing vehicle emissions. This part alters or deletes the emissions equipment on your car, and may not meet emissions standards in all states.